03 2.0Hdi Running Issue

[Sugar_Puff]

Hi all I have a 2.0 hdi relay and its purely to take the bike on track days and use the off trip to work to keep it in use its got 148k and the and it doesn't clock miles probably has about 170k on it since it stopped clocking,

 

Anyway took the old girl from home (Woking Surrey) to snetterton the other week drove up one evening its always been a bit funny performance wise I can put my foot down at it goesbut then as I'm about to changre gear say around 4,000rpm i get a load of boost come in and it goes really well but it doesn't always happen and when it doesn't happen I'm not getting that nice amount of boost, anyway stopped at a services to grab dinner on my journey was stopped for about 25/30 mins jumped back on the carriage way and as I was accelerating it was de accelerating then accelerating then backing back off the whole time I had my foot down, for about 20 minutes I toyed about with my throttle positioning flooring it etc nothing changed its mind it continued, was fine on the way home the next day but I can't figure it out, due to work I've not had chance to really look at it although I know the vaccume lines are starting to perish I can't see a form of boost leak although not thoroughly looked,

Anyone shed a light?

Thanks in advance.

[paul.h]

See if somebody comes up with a few ideas but if not changing gear until about 4000 rpm I would think that is about the limit for a diesel and for normal use changing up about 2000 rpm would be about right. There is little point in driving it like a petrol car since the torque on a diesel peaks around 2000 rpm so it will pull well around that. It might be possible that the boost is being backed off since the engine is at its rev limit.

 

On the C5 if the speedo stops working it may be possible to repair it and this may also apply to the C8:

19. Speedometer stops working.

The motor at the back of the speedo can be replaced to fix this - see http://www.citroen-o...ometer-repairs/